Struct JordanWignerTransform 

pub struct JordanWignerTransform { /* private fields */ }

Jordan-Wigner transformation for mapping fermions to qubits

Implementations

impl JordanWignerTransform

pub fn new(num_modes: usize) -> Self

Create new Jordan-Wigner transformer

pub fn transform_operator_to_sum( &mut self, op: &FermionicOperator, ) -> Result<PauliOperatorSum>

Transform a single fermionic operator to its complete Pauli operator sum via JW.

Returns the full Jordan-Wigner representation as a PauliOperatorSum (possibly containing multiple terms for operators like creation/annihilation).

JW mappings (n = num_modes, Z_k below denotes Z on mode k):

• n_i = (I − Z_i)/2 → two Pauli strings (constant + Z_i)
• c†_i = (Z_0⋯Z_{i-1})(X_i − iY_i)/2 → two Pauli strings
• c_i = (Z_0⋯Z_{i-1})(X_i + iY_i)/2 → two Pauli strings
• Hopping c†_from c_to via full product → four raw terms reduced to two
• Interaction c†⋯c_l via full product

pub fn transform_operator( &mut self, op: &FermionicOperator, ) -> Result<PauliString>

Transform fermionic operator to a single representative Pauli string.

This returns only the X-part of the JW decomposition (for creation/annihilation) or the Z-only part of the number operator, and is used internally for Pauli-composition chains. For complete expectation values use transform_operator_to_sum.

pub fn transform_string( &mut self, fermionic_string: &FermionicString, ) -> Result<PauliOperatorSum>

Transform fermionic string to Pauli operator sum.

Each fermionic operator is expanded to its complete JW Pauli representation; successive operator sums are then multiplied together (outer product). The overall fermionic coefficient is applied last.

pub fn transform_hamiltonian( &mut self, hamiltonian: &FermionicHamiltonian, ) -> Result<PauliOperatorSum>

Transform fermionic Hamiltonian to Pauli Hamiltonian